1. Wahlbeck K, Cheine M, Essali MA. Clozapine versus typical neuroleptic medication for schizophrenia. Cochrane Database Syst Rev. 2000;2:CD000059 (update in: Cochrane Database Syst Rev. 2009;1:CD000059).
2. Tuunainen A, Wahlbeck K, Gilbody SM. Newer atypical antipsychotic medication versus clozapine for schizophrenia. Cochrane Database Syst Rev. 2000;2:CD000966.
3. Breier AF, Malhotra AK, Su TP, et al. Clozapine and risperidone in chronic schizophrenia: effects on symptoms, parkinsonian side effects, and neuroendocrine response. Am J Psychiatry. 1999;156:294–8.
4. Azorin JM, Spiegel R, Remington G, et al. A double-blind comparative study of clozapine and risperidone in the management of severe chronic schizophrenia. Am J Psychiatry. 2001;158:1305–13.
5. Conley RR, Tamminga CA, Kelly DL, et al. Treatment-resistant schizophrenia patients respond to clozapine after olanzapine non-response. Biol Psychiatry. 1999;46:73–7.